Download e-book for iPad: Advances in plant glycosides, chemistry and biology: by China) International Symposium on Plant Glycosides (1997

By China) International Symposium on Plant Glycosides (1997 Kunming, Chong-Ren Yang, Osamu Tanaka, Chong-Ren Yang, Osamu Tanaka

ISBN-10: 0444501800

ISBN-13: 9780444501806

Within the plant state various chemical parts ensue in a glycoside shape (conjugation with sugar). Glycosides are vital, secondary metabolites. The structural variety is as a result of the large quantity of sorts and stereochemical configurations of the sugar part. Aglycones belong to terpenoid, steroid, flavonoid, quinonoid, lignan, different easy phenolics, and isothiocyanate. despite the fact that, organic actions of glycosides are, in lots of situations, prone to the character of sugar moieties, although their aglycone is the same.

Since the 80s, plant glycosides were attracting an expanding quantity of curiosity from botanists and phytochemists world-wide for the subsequent reasons:

• they're tough to isolate and purify

• they've got a crucial organic functionality in flora and memorable organic activities

• they're a extremely important source of usual medication, health and wellbeing meals, cosmetics and f

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Extra resources for Advances in plant glycosides, chemistry and biology: proceedings of the International Symposium on Plant Glycosides, August 12-15, 1997 Kunming, China

Example text

O i 0a,. HO~O OH ", HO "" OH mornordinI (19): R=H O o. HO,,,~-O),-O- A " o' oH o-CO>-or% I-O OCC(Me)321 MeOOC 20 MeOOC M O M O , , , ~ . O-A "J-o O-A OH " MeOOC = O-~. MeOOC j) MOMO,,, k) MOMO'"~-O~o-A O ~"0 '0 ~---{. ~ "~ "~ ~,,v ;OOMe ~-o ... HO/DMF; b) TBDMS-CI, imidazole/DMF; c) 80%aqueous AcOH; d) Pb(OAc)4/benezene; e) NaCIO2, NH2SO3H/75% aqueous 1,4dioxane; f) CH2N2- etherate/MeOH; g) pivaloyl chloride, DMAP/pyridine,0*(3; h) MOM-CI, i-Pr2EtN/CH2CI2; i) 5% NaOMe-MeOH; j) PCC/benzene; k) NaBHdMeOH Chart 3.

45 (11)(1997), in press(No. 194). 11. , Murakami T. , Kadoya M. , Chem. Pharm. , 44, 1305~1313(1996) 12. , Biol. 34 Pharm. , presented at the 1lth Symposium on the Development and Application of Naturally Occurring Drug materials, Tokyo, Aug. 1997, Abstracts paper p. 103-106. 13. , 45, 877-882(1997). 14. , Price K. , Fenwick G. , J. Sci. , 43 101107(1988); C) Jain D. , Thakur R. , Bajpai A, Sood A. , Phytochemistry, 27, 1216---1217 (1988); d) Li C. , Brownson D. , Mabry m. , Bell E. , ibid. 42, 443---445(1996).

On the basis of above mentioned evidence, although some other pathways could be considered, an electrochemical process would be proposed for the present anodic oxidation. Since the present anodic oxidation method is need no previous protection of hydroxyl groups, it may be significant to the synthesis of partially oxidized derivative from triterpene NBS / dioxane-H20 (or Br2 / aq. NaHCO3; CrO 3 / pyridine) -/ ~OH HO " K ~ ~ , ) ~ ;~ 28 " I o. ~ protoaescigenin (57) ~'CH2OH H e O HOr--O OH HO~ ()H () " 60--64 o.

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Advances in plant glycosides, chemistry and biology: proceedings of the International Symposium on Plant Glycosides, August 12-15, 1997 Kunming, China by China) International Symposium on Plant Glycosides (1997 Kunming, Chong-Ren Yang, Osamu Tanaka, Chong-Ren Yang, Osamu Tanaka


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